Page 193 - Forensic Structural Engineering Handbook

5.26 ENGINEERING RESPONSE TO FAILURES

results. This is most feasible for fundamental standardized tests, such as concrete strength
tests and tensile tests, and, in fact, this was the approach taken in the investigation of the
scaffold collapse at Four Times Square. More specialized tests will usually have to be
undertaken by individual parties.

Sharing of basic information will be greatly facilitated if the leading investigator has
neutral interests and fosters a climate of cooperation. Naturally, in cases where there is a
possibility of litigation, the forensic engineer should consult with the client or the client’s
attorney to be sure that he or she does not inadvertently compromise the client’s interests.

INITIAL DOCUMENT GATHERING

Gathering of project documents is a top priority. Some documents may be readily obtainable,
and others will require perseverance. Types of documents that are typically sought include:

• Design drawings and specifications
• Boring logs
• Calculations by the engineer of record and by specialty engineers
• Erection drawings, shop drawings, (Fig. 5.19) and other contractor submittals

(a)
FIGURE 5.19 (a) An unreinforced concrete corbel snapped off,
causing a partial collapse (b) Shop drawings clearly showed rein-
forcement in the wall corbels, which helped to quickly focus the
investigation of this collapse.